# Pocket Client Book vs Trainer Calendar

The clearest difference is in-app purchases: Trainer Calendar at none against Pocket Client Book's 2. Trainer Calendar also leads on update cadence (daily vs every 2 weeks) and iOS requirement (15.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Pocket Client Book sells 2 in-app purchases, starting at $4.99 per month. Trainer Calendar asks for nothing beyond the download.

Pocket Client Book ships an update every 2 weeks, Trainer Calendar daily. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Pocket Client Book | Trainer Calendar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Size | 15 MB | 4 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Artem Danylov](https://appshunter.io/developer/6778438593) | [Zinaid Salkica](https://appshunter.io/developer/6808235424) |

## What reviewers say

### Pocket Client Book

[App page](https://appshunter.io/ios/app/pocket-client-book-diary/id6780065737)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pocket Client Book PRO Monthly | $4.99 | per month |
| Pocket Client Book PRO Lifetime | $39.99 | one-time |


### Trainer Calendar

[App page](https://appshunter.io/ios/app/trainer-calendar/id6808235421)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Pocket Client Book free?

Pocket Client Book is free to download, with in-app purchases available.

### Is Trainer Calendar free?

Trainer Calendar is free to download, with no in-app purchases.

### Do Pocket Client Book or Trainer Calendar have ads?

Neither Pocket Client Book nor Trainer Calendar shows ads.

### Which is updated more often, Pocket Client Book or Trainer Calendar?

Pocket Client Book ships an update every 2 weeks, and Trainer Calendar daily. Most recently, Pocket Client Book was updated on October 14, 2026 and Trainer Calendar on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*